1109491709491 has 12 divisors (see below), whose sum is σ = 1222846947616. Its totient is φ = 1005880479120.

The previous prime is 1109491709453. The next prime is 1109491709551. The reversal of 1109491709491 is 1949071949011.

It is a happy number.

It is not a de Polignac number, because 1109491709491 - 2⁷ = 1109491709363 is a prime.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1109491701491) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12447900 + ... + 12536713.

Almost surely, 2^{1109491709491} is an apocalyptic number.

1109491709491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1109491709491 is a deficient number, since it is larger than the sum of its proper divisors (113355238125).

1109491709491 is a wasteful number, since it uses less digits than its factorization.

1109491709491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24985002 (or 24984991 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 55.

The spelling of 1109491709491 in words is "one trillion, one hundred nine billion, four hundred ninety-one million, seven hundred nine thousand, four hundred ninety-one".